ISOPODS OF NORTH AMERICA. 



547 



and Pribilof Islands, Alaska, on Nectocrangon lav; Arctic Ocean, on 

 Nectocrang(m lar; Popoff Straits, on Nectocrangon cnixxa; between 

 Bird and Najifai Islands, on Nectocrangon alascenats. 



List of Crangonidie on which Ai'geia pugette7isi.s is found parasitic: 



Nectocrangon ovifer Rath bun. 

 Nectocrangon lar (Owen). 

 Nectocrangon alascensis Kingsley. 

 Nectocrangon crassa Rathbun. 

 Nectocrangon dentata Rathbun. 

 Crago nigromaculata (Lockington) 

 Crago franciscorum angiistimana 

 Imn). 



(Rath- 



Crago dalli (Rathbun) . 

 Crago communis (Rathbun). ■ 

 Crago propinqua ( Stini pson ) . 

 Crago nigricaudu (Stiiiii).siin) . 

 Crago alascensis (Lockington). 

 Crago alascensis elongata (Rathbun). 

 Crago alba (Hohnes). 

 Crago nmnita (Dana). 



immature fornix. — A feniule (probably in tlie first post-larval stage) 

 has the thoracic processes well developed, sometimes oidy on one side. 



Fig. 590. — Argeia pugettensis. sixth leg of specimens found on: a, Nectocrangon dentata 

 F*R0M Afognak Bay, Afognak Thland. X 39. 6, Nectocrangon ckassa from Cape Newenham, 

 Ala.ska. ■: 20|. 



The inner pleopoda of the hr.>t pair are usually present; all the outer 

 pleopoda, the other four inner pleopoda, and the uropoda are not 



Fig. 591.— Argeia pugettensis. Seventh leg of specimens found on: a, Nectocrangon alascen- 

 sis from .southwest of Sannakh Islands. .Alaska, x 41. 6, Crago nigromaculata from San 

 Diego Bay, California, x 41. c, Crago dalli fro.m south of Amak Island, .\laska. x 41. 

 d, Crago communis from Akutan Island, Bering Strait, x 41. 



